Greg,
You have an open truss system, which is whats mostly creating your issue.
Wrap the telescope in a shroud, and this should help out heaps.
I made a light shroud by buying some cheap dark cloth, and sewing (My Wife) some velcro along the side so i can remove and attach it to the truss.
Try this first, rather than wires and dew straps starting to occupy the spider.
Theo
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